The Urth 86-62mm adapter ring enables compatibility between 86mm lens threads and 100mm square filter systems with 62mm thread connections. This precision-engineered component allows photographers to utilize 100mm square filters on lenses with 86mm filter threads, expanding creative possibilities while maintaining optical quality. Constructed from durable aluminum alloy with an anodized black finish, the adapter features precise machining for secure, wobble-free attachment. The adapter measures approximately 5 mm in thickness with an outer diameter of 86 mm and an inner thread diameter of 62 mm, weighing approximately 45 g. Its compact design minimizes vignetting while providing a reliable connection between filter systems. The adapter includes standard 0.75 mm pitch threads on both sides for compatibility with most professional filter holders. This component serves photographers requiring square filter flexibility with larger diameter lenses, particularly useful for landscape, architectural, and commercial photography applications. The adapter maintains proper alignment between filter and lens elements to preserve image quality without introducing distortion or light leaks. Its matte black interior surface prevents internal reflections that could cause flare or contrast reduction. The adapter works with most major brands of 100mm square filter systems when used with appropriate filter holders. For optimal performance, ensure both lens and filter holder threads are clean and undamaged before installation. This adapter represents a practical solution for photographers expanding their filter systems across multiple lens diameters without requiring duplicate filter investments. The Urth adapter ring provides reliable functionality for professional photographic workflows where equipment compatibility and optical precision are essential considerations.